The bass guitar blues scale is the same as a minor pentatonic scale with an extra note. Often people refer to the extra not as the ‘blue note’. This is because it is this note that when combined with the other notes in the scale that give it that bluesy feeling and sound. The blue note also creates a feeling of tension that is often found in blues music.
Sometimes the bass guitar blues scale is used in all different genres of music outside of blues. It is also commonly used in rock, funk and country due to blues being at the foundation of modern music.
Another interesting thing about the bass guitar blues scale is that is has six different notes. A major scale has seven notes and a pentatonic scale has five. When you actually play a blues scale on your bass you will normally play more than just six notes. This is because you will play those notes in different places of the bass guitar fretboard.
Here are the notes of a C blues scale:
C, Eb, F, Gb, G and Bb.
Hopefully this has given you a quick understanding of the bass guitar blues scale and how it works. I highly recommend that you pick up your bass and have ago at playing it. It can be great fun to improvise around with the notes of the scale. So why not have ago?